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3 years ago

Jake completed a marathon race 3 hours and 12 minutes.write Jakes running time as a decimal

2 answers:

6 0

If an hour is equal to 1, then we know that the answer is more than 3. 12 minutes is equal to 1/5 of an hour, and if we add 3 and 1/5, we get the answer.

3 1/5

In-s [12.5K]3 years ago

4 0

Answer:

Jake's running time as a decimal is:

3.2 hours

Step-by-step explanation:

We are given that:

Jake completed a marathon race 3 hours and 12 minutes.

We know that:

1 hour= 60 minutes

1 minute= 1/60 hour

12 minutes = 12/60 minutes

= 0.2 hour

3 hours and 12 minutes= (3+0.2) hours

= 3.2 hours

Hence, Jake's running time as a decimal is:

3.2 hours

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(i) 71640, 321970

(ii) 1143, 47205, 2316

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(v) 12320, 59016, 46424

Step-by-step explanation:

(i) In order for any number to be divisible by 5, its last digit must be either 0 or 5.

In this case, we should add a last digit, so we opt for 0 without any doubt since it gives a smaller number than 5 as the last digit: 71640 is smaller than 71645, the same way as 321970 is smaller than our second option, 321975.

(ii) If the sum of a number's digits gives a number divisible by 3, then the main number is also divisible by 3.

This means that we have to do some addition:

1_43: 1 + 4 + 3 = 8. Eight is not divisible by 3. But 9 is. So the smallest digit we can add for it to be divisible by three is 1: 1143.

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(iii) Only numbers that are divisible by both 2 and 3 are also divisible by 6.

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4 + 2 + 8 = 14 which is not divisible by 3. But 15 is. So the smallest digit we need is 1: 1428.

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7 + 2 + 1 = 10 which is not divisible by 3 but 12 is. We will then choose to add 2: 7212.

(iv) A number is divisible by 4 only if the number that is formed by its two last digits is also divisible by 4..

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91__: Here we need to add both of the two last digits, and this should be the easiest example! All numbers that end in 00, meaning they have a round number of hundreds, are divisible by 4! Therefore our option is: 9100.

670_: In this case, we apply the same rule from the last example - and we choose 0: 6700.

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